ten days

I exercise.

私は運動をします

I exercise at the gym.

私は体育館で運動をします

I exercise at the gym with my father.

私は父と体育館で運動をします

I exercise at the gym with my father early in the morning.

私は早朝に父と体育館で運動をします

I exercise at the gym with my father early in the morning for ten days.

私は十日間早朝に父と体育館で運動をします